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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4929656b79abff59338941aa1f879d311e082b16f567a03d26349e9142b31f09' 
  AND token = '0zouOnD28xCz4Cu5aroQpMJeQB+qpSqns2NDo7VbC+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}